The Tor Browser / file revision

 # This Source Code Form is subject to the terms of the Mozilla Public

 # License, v. 2.0. If a copy of the MPL was not distributed with this

 # file, You can obtain one at http://mozilla.org/MPL/2.0/.

 """

 Take the *.framedata files from graph-frameclasses.js and combine them

 into a single graphviz file.

 stdin: a list of .framedata file names (e.g. from xargs)

 stdout: a graphviz file

 e.g. `find <objdir> -name "*.framedata" | python aggregate-frameclasses.py |

   dot -Tpng -o frameclasses-graph.png -`

 """

 import sys

 classdict = {}

 for line in sys.stdin:

     file = line.strip()

     fd = open(file)

     output = None

     for line in fd:

         if line.startswith('CLASS-DEF: '):

             cname = line[11:-1]

             if cname not in classdict:

                 output = classdict[cname] = []

             else:

                 output = None

         elif output is not None:

             output.append(line)

 sys.stdout.write('digraph g {\n')

 for olist in classdict.itervalues():

     for line in olist:

         sys.stdout.write(line)

 sys.stdout.write('}\n')